Tailgate assembly having a door and method of providing access to a cargo bed

ABSTRACT

A tailgate assembly for a vehicle includes, among other things, a frame sub-assembly that includes a driver side section, a passenger side section, and a connection member coupling the driver side section to the passenger side section. The assembly further includes a door sub-assembly disposed between the driver side section and the passenger side section. The door sub-assembly and the frame sub-assembly are pivotable together about a first axis between a tailgate closed position and a tailgate open position. The door sub-assembly is pivotable relative to the frame sub-assembly about a second axis between a door closed position and a door open position. The door sub-assembly in the door open position provides a cargo bed access opening that extends vertically downward at least as far as a floor of the cargo bed.

RELATED APPLICATIONS

This application is a continuation of prior U.S. application Ser. No.16/918335, filed 1 Jul. 2020, the entirety of which is hereinincorporated by reference.

TECHNICAL FIELD

This disclosure relates generally to a tailgate assembly for a vehicleand, more particularly, to a tailgate assembly having a door that can beopened to, among other things, help a user access cargo within a cargobed of the vehicle.

BACKGROUND

Vehicles, such as pickup trucks, include a cargo bed. A tailgateassembly can enclose one end of the cargo bed when the tailgate assemblyis in the closed position. The tailgate assembly can pivot to the openposition where the tailgate assembly is substantially horizontal andaligned with a floor of the cargo bed.

SUMMARY

A tailgate assembly for a vehicle according to an exemplary aspect ofthe present disclosure includes, among other things, a framesub-assembly that includes a driver side section, a passenger sidesection, and a connection member coupling the driver side section to thepassenger side section. The assembly further includes a doorsub-assembly disposed between the driver side section and the passengerside section. The door sub-assembly and the frame sub-assembly arepivotable together about a first axis between a tailgate closed positionand a tailgate open position. The door sub-assembly is pivotablerelative to the frame sub-assembly about a second axis between a doorclosed position and a door open position. The door sub-assembly in thedoor open position provides a cargo bed access opening that extendsvertically downward at least as far as a floor of the cargo bed.

In another example of the foregoing assembly, the first axis istransverse to the second axis.

In another example of any of the foregoing assemblies, the first axis isa horizontally extending axis and the second axis is a verticallyextending axis.

In another example of any of the foregoing assemblies, the tailgate isvertically aligned when in the tailgate closed position. The tailgate ishorizontally aligned when in the tailgate open position.

In another example of any of the foregoing assemblies, the driver sidesection includes a driver side outer panel, the passenger side sectionincludes a passenger side outer panel, and the door sub-assemblyincludes a door outer panel. No portion of the door outer panelhorizontally overlaps with any portion of the driver side outer panel orthe passenger side outer panel.

Another example of any of the foregoing assemblies includes a tailgatestep that is at least partially retractable within the doorsub-assembly. The tailgate step is extendable to a stepping positionwhen the door sub-assembly and the frame sub-assembly are in thetailgate open position.

Another example of any of the foregoing assemblies includes a bumperstep. A longitudinal centerline of the vehicle extends through thebumper step and the cargo bed access opening.

Another example of any of the foregoing assemblies includes a stepassembly having a flip step moveable between a stowed position and aflipped position. The flip step in the flipped position provides a stepsurface for a user.

In another example of any of the foregoing assemblies, the flip stepincludes ribbed support structure on the step surface.

In another example of any of the foregoing assemblies, the flip stepincludes a channel configured to receive at least a portion of a trailerhitch when the flip step is in the flipped position.

In another example of any of the foregoing assemblies, the step assemblyhaving the flip step is adjacent a bumper step.

In another example of any of the foregoing assemblies, at least onegooseneck hinge pivotably connects the door sub-assembly to the framesub-assembly.

Another example of any of the foregoing assemblies includes a tailgatestep that at least partially retracts within the door-subassembly whenin a stowed position.

In another example of any of the foregoing assemblies, the doorsub-assembly includes a handle and button that is actuated to initiate adoor open request. The door-sub assembly further includes a button thatis actuated to initiate a tailgate open request.

A method of providing access to a cargo bed of a vehicle according toanother exemplary aspect of the present disclosure includes a step ofproviding a tailgate assembly that includes a door sub-assembly and aframe sub-assembly, and pivoting the door sub-assembly relative to theframe sub-assembly to provide a cargo bed access opening. The cargo bedaccess opening extends vertically downward at least as far as a floor ofthe cargo bed.

Another example of the foregoing method includes a step of unlatchingthe door sub-assembly from the frame sub-assembly to permit thepivoting.

Another example of any of the foregoing methods includes permitting theunlatching when the tailgate assembly is in a tailgate closed positionand preventing the unlatching when the tailgate is in a tailgate openposition.

Another example of any of the foregoing methods includes permitting thetailgate assembly to pivot from a tailgate closed position to a tailgateopen position when the door sub-assembly is in the door closed position,and preventing the tailgate assembly from pivoting from the tailgateclosed position to the tailgate open position when the door sub-assemblyis in the door open position.

Another example of any of the foregoing methods includes, when thedoor-subassembly is in a door closed position, pivoting the tailgateassembly to a tailgate open position, and extending a tailgate step froma stowed position into a stepping position. The tailgate step in astowed position is at least partially retracted within thedoor-subassembly.

The embodiments, examples and alternatives of the preceding paragraphs,the claims, or the following description and drawings, including any oftheir various aspects or respective individual features, may be takenindependently or in any combination. Features described in connectionwith one embodiment are applicable to all embodiments, unless suchfeatures are incompatible.

BRIEF DESCRIPTION OF THE FIGURES

The various features and advantages of the disclosed examples willbecome apparent to those skilled in the art from the detaileddescription. The figures that accompany the detailed description can bebriefly described as follows:

FIG. 1 illustrates a rear perspective view of a pickup truck having acargo bed and a tailgate assembly in a tailgate closed position.

FIG. 2 illustrates a rear perspective view of the tailgate assembly in atailgate open position.

FIG. 3 illustrates a rear perspective view of the tailgate assembly ofFIG. 1 with a door subassembly of the tailgate assembly in a door openposition.

FIG. 4 illustrates a rear and top perspective view of the tailgateassembly of FIG. 1 with the door subassembly of the tailgate assembly inthe door open position.

FIG. 5 illustrates a flip down step assembly of the pickup truck of FIG.1 in a stowed position.

FIG. 6 illustrates the flip down step assembly of FIG. 5 in a flippedposition.

FIG. 7 illustrates an expanded view of selected portions of the tailgateassembly of FIG. 1.

FIG. 8 illustrates a top view of selected portions of the tailgateassembly of FIG. 1.

FIG. 9 illustrates a perspective view of selected portions of thetailgate assembly of FIG. 1.

FIG. 10 illustrates a perspective view of a tailgate step of thetailgate assembly of FIG. 1.

FIG. 11 illustrates a first example method of controlling the tailgateassembly of FIG. 1.

FIG. 12 illustrates a second example method of controlling the tailgateassembly of FIG. 1.

DETAILED DESCRIPTION

This disclosure details exemplary tailgate assemblies that include adoor. The door can be opened to provide an opening that helps a user toaccess cargo within a cargo bed, among other things.

FIG. 1 illustrates a vehicle 10, here a pickup truck, having a cargo bed14 that is defined by a pair of sidewalls 18, a front wall 22, and atailgate assembly 26 according to an exemplary aspect of the presentdisclosure.

The tailgate assembly 26 includes, among other things, a framesub-assembly 30 and a door sub-assembly 34.

The tailgate assembly 26 is pivotable about a first axis A1 relative tothe cargo bed 14 between a tailgate closed position shown in FIG. 1 anda tailgate open position shown in FIG. 2. The example tailgate assembly26 is vertically aligned when in the tailgate closed position andhorizontally aligned when in the tailgate open position. Vertical andhorizontal, for purposes of this disclosure, are with reference toground in the ordinary orientation of the vehicle 10 during operation.

The door-sub assembly 34 is in a door closed position and is latched tothe frame sub-assembly 30 when the frame sub-assembly 30 and the doorsub-assembly 34 are pivoted between the tailgate closed position and thetailgate open position. Thus, the frame sub-assembly 30 and the doorsub-assembly 34 pivot together when the tailgate assembly 26 aretransitioned back and forth between the tailgate closed position and thetailgate open position.

When in the tailgate closed position, the door sub-assembly 34 ispivotable relative to the frame sub-assembly 30 about a second axis A2between a door closed position shown in FIG. 1 and a door open positionshown in FIG. 3. The first axis A1 is a horizontally extending axis inthis example. The second axis A2 is transverse to the first axis A1 andis a vertically extending axis in this example.

The door sub-assembly 34 in the door open position provides a cargo bedaccess opening O. In this example, the cargo bed access opening Oextends vertically downward at least as far as a floor 38 of the cargobed 14.

As shown in FIG. 4, a user 42 can access the cargo bed 14 through thecargo bed access opening O provided by the door sub-assembly 34 in thedoor open position. Placing the door sub-assembly 34 in the door openposition allows the user 42 to move closer to the cargo bed 14 than, forexample, if the tailgate assembly 26 were moved to the tailgate openposition of FIG. 2.

In FIG. 4, a cargo management divider panel 46 is engaged within thecargo bed 14 to help confine cargo to a rear of the cargo bed 14. Thecargo management divider panel 46 can help to confine cargo and makesure cargo does not shift forward toward the front wall 22.

The cargo bed access opening O can also provide clearance for the user42 to enter the cargo bed 14 to retrieve cargo. When entering the cargobed 14, the user 42 can place their foot on a bumper step 50 within abumper 54 of the vehicle 10. The user 42 can then step up into the cargobed 14. The user may grasp an upper surface of the frame sub-assembly 30when stepping up into the cargo bed 14 through the cargo bed accessopening O.

The bumper step 50 and the cargo bed access opening O are both disposedat a centerline of the vehicle 10. The user 42 is thus able to readilyappreciate that the bumper step 50 and the cargo bed access opening Ocan be utilized to enter the cargo bed 14.

In the exemplary embodiment, the tailgate assembly 26 with the singledoor sub-assembly 34 simplifies the process of entering the cargo bed 14through the cargo bed access opening O. The user 42 does not need tochoose which door (from among several doors) to open in order to enterthe cargo bed 14. Further, since the door-subassembly 34 does not extendfrom the sidewall 18 on the driver side all the way to the sidewall 18on the passenger side, the user 42 can be standing behind the vehicle 10and still be able to open the door sub-assembly 34. This can help toshield the user 42 from passing traffic, for example.

As the cargo bed access opening O extends vertically downward at leastas far as the floor 38, the user 42 has a relatively clear path to stepup into the cargo bed 14 or to load cargo into the cargo bed 14. Thatis, the user 42 is not required to step over any portion of the tailgateassembly 26 and then down onto the floor 38.

In this example, the bumper step 50 can be utilized in connection with astep assembly 58 as shown in FIGS. 5 and 6. The step assembly 58includes, in this example, a support bracket 62 and a flip step 66. Thesupport bracket 62 can securely attach the step assembly 58 to thebumper 54 at the bumper step 50. The flip step 66 is pivotably connectedto the support bracket 62.

The flip step 66 can pivot relative to the support bracket 62 from thestowed position of FIG. 5 to the flipped position of FIG. 6. In theflipped position, an underside 70 of the flip step 66 is presented tothe user 42. The underside 70 can be used by the user 42 as a stepsurface.

In the flipped position, the underside 70 is vertically lower than astep surface provided by the bumper step 50. The user 42, particularly auser having a small stature, can place their foot on the underside 70 ofthe flip step 66 in the flipped position of FIG. 6. From the flip step66, the user can then step onto the bumper step 50 or step into thecargo bed 14 utilizing the bumper step 50.

In this example, the underside 70 includes a ribbed support structure 74that can help prevent the user 42 slipping on the underside 70 whenstepping on the flip step 66.

In the example of FIGS. 5 and 6, a trailer hitch 78 of the vehicle 10 iscoupled to a trailer hitch 82 of a trailer. The flip step 66 includes achannel 86 that receives at least a portion of the trailer hitch 82 whenthe flip step 66 is in the flipped position. Receipt of the trailerhitch 82 can help to stabilize the flip step 66 and present theunderside 70 as a stepping surface at a position vertically lower thanan uppermost surface of the trailer hitch 82 of the trailer.

The support bracket 62 of the step assembly 58 further includes achannel 88 that provides an area for the channel 86 of the flip step 66to nest within when the flip step 66 is in the stowed position of FIG.5.

The flip step 66, in the example embodiment, further includes lockingtabs 90 that lock the flip step 66 in the stowed position. The flip step66 can be locked in the stowed position when not in use. The user 42 canunlock the locking tabs 90 when moving the flip step 66 from the stowedposition to the flipped position is desired.

With reference now to FIGS. 7 and 8, the door sub-assembly 34 ispivotably coupled to the frame sub-assembly 30 via two hinges 94, whichare gooseneck hinges in this example. The hinges 94 can permit the doorsub-assembly 34 to pivot relative to the frame sub-assembly 30 well awayfrom the cargo bed access opening O. The hinges 94 can include two doorcheck positions, say 45 and 90 degrees.

The frame sub-assembly 30 includes, among other things, a driver sidesection 100, a passenger side section 104, and a connection member 108.These pivot together when the frame sub-assembly 30 is moved between thetailgate closed position and the tailgate open position. The connectionmember 108, notably, dips vertically downward to help the keep theconnection member 108 below the floor 38 of the cargo bed 14.

As shown in FIG. 1, the driver side section 100 includes an outer panel112, and the passenger side section 104 includes an outer panel 116.When the tailgate assembly 26 is in the tailgate closed position of FIG.1, the panels 112 and 116 can be viewed by an individual standing behindthe vehicle 10. The connection member 108, however, is concealed behindthe bumper 54, a fascia 120, or some combination of these.

The door sub-assembly 34 includes an outer panel 124 that is alsovisible when the tailgate assembly 26 is in the tailgate closed positionof FIG. 1. Notably, no portion of the panel 112 or the panel 116laterally overlaps with the door outer panel 24. In particular, thepanel 112 does not include a section extending vertically beneath thepanel 124 of the door sub-assembly 34, and the passenger side panel 116does not include a section extending vertically beneath the panel 124 ofthe door sub-assembly 34. Instead, the door sub-assembly 34 isincorporated into the tailgate assembly 26 utilizing only two splitlines 128 extending vertically across the tailgate assembly 26. Thus,the door sub-assembly 34 is incorporated into the tailgate assembly 26with relatively little aesthetic disruption.

The support structures within the tailgate assembly 26 can include aplurality of tubular beam members 132 as shown in FIG. 7. The connectionmember 108 is a tubular support beam in this example. The connectionmember 108 can be considered a tie beam. From time to time, the user 42may choose to decouple the door sub-assembly 34 from the tailgateassembly 26. This may be useful if the vehicle 10 is used to haul atrailer, such as a gooseneck trailer. Removing the door sub-assembly 34can help with visibility when aligning the trailer to the vehicle 10,for example.

The hinges 94 can threadably connect to at least one of the beam members132 when coupling the door sub-assembly 34 to the frame sub-assembly 30through the hinges 94. In this example, threaded posts 36 of the hinges194 extend through openings 140 in at least one of the beam members 132.A nut (not shown) can then be torqued down onto to the threaded post 136to secure the respective hinge 94 relative to the frame sub-assembly 30.The openings 140 can be oversized to permit alignment of the hinges 94relative to the frame sub-assembly 30, which can facilitate controllinggaps and margins between the frame sub-assembly 30 and door sub-assembly34.

The door sub-assembly 34 can be used in connection with a tailgate step150 and grab handle 154 shown in FIG. 10. When the tailgate assembly 26is in the tailgate open position, the user 42 can position the tailgatestep 150 into a stepping position and then use the tailgate step 150 toenter the cargo bed 14.

The tailgate step 150 can be moved to a stowed position when not in use.The tailgate step 150 can at least partially retract within the doorsub-assembly 34 when in the stowed position. Similarly, the grab handle154 can be pivoted to stowed position when not in use.

The tailgate step 150 can be a commonly designed tailgate step that isused in connection with the tailgate assembly 26 having the doorsub-assembly 34 and another tailgate assembly that does not include adoor sub-assembly. This can, among other things, reduce overall buildcomplexity.

With reference now to FIG. 11, a method 200 of controlling the tailgateassembly 26 of FIGS. 1-4 helps to ensure that the door sub-assembly 34is moved to the door open position when the tailgate assembly 26 is inthe tailgate closed position, but not when the tailgate assembly 26 isin the tailgate open position. This method 200 can help to avoid damageresulting from the door sub-assembly 34 transitioning to the door openposition when the tailgate assembly 26 is, for example, in the tailgateopen position.

During ordinary operation of the vehicle 10, the tailgate assembly 26 isin the closed tailgate position of the FIG. 1, and the door sub-assembly34 is in closed position. At the step 204, the vehicle 10 receives adoor open request. The user 42 may press a button on a handle 160 toinitiate the door open request. The door open request could instead beinitiated from a keyfob, or by pressing a button within a cabin of thevehicle 10.

At a step 208, the method 200 then assesses whether or not the tailgateassembly 26 is in the tailgate closed position. The assessment caninclude checking the status of powered latches that hold the tailgateassembly 26 in the tailgate closed position. If the powered latchesindicate a closed state, the method 200 proceeds to a step 212 where thepowered latches are commanded open. The method 200 then pivots the doorsub-assembly 34 to the door open position. The pivoting of the doorsub-assembly 34 could be automatic or could be a manual pivoting by theuser 42.

If, at the step 208, the method 200 assesses that the tailgate assembly26 is not in the tailgate closed position, the method 200 moves from thestep 208 to a step 220. At the step 220, the method 200 initiates a useralert, such as an audible chime. The alert can notify the user 42 aboutthe state of the tailgate assembly 26. The user 42 can then address theissue by moving the tailgate assembly 26 to the closed tailgateposition. The method 200 moves from the step 220 to the step 204.

With reference now to FIG. 12, a method 300 of controlling the tailgateassembly 26 of FIGS. 1-4 helps to ensure that the tailgate assembly 26is moved to the tailgate open position when the door sub-assembly 34 isin the door open position, but not when the tailgate assembly 26 is inthe tailgate open position. The method 300 can help to avoid damageresulting from the tailgate assembly 26 transitioning to the tailgateopen position when the door sub-assembly 34 is in the door openposition.

During ordinary operation of the vehicle 10, the tailgate assembly 26 isin the closed tailgate position of the FIG. 1, and the door sub-assembly34 is in the door closed position. At the step 304, the vehicle 10receives a tailgate open request. The user 42 may press a button on ahandle 164 to initiate the tailgate open request. The door open requestcould instead be initiated from a keyfob, or by pressing a button withina cabin of the vehicle 10.

At a step 308, the method 300 then assesses whether or not the doorsub-assembly 34 is in the door closed position. The assessment caninclude checking the status of powered latches that hold the doorsub-assembly 34 in the door closed position. If these powered latchesindicate a closed state, the method 300 proceeds to a step 312 where themethod 200 releases tailgate latches that hold the tailgate assembly 26in the closed tailgate position. The method 300 then moves to the step316 where the tailgate assembly 26 is pivoted to the open tailgateposition. The pivoting of the tailgate assembly 26 could be automatic orcould be a manual pivoting by the user 42.

If, at the step 308, the method 300 assesses that the door sub-assembly34 is not in the door closed position, the method 300 moves from thestep 308 to a step 320. At the step 320, the method 300 initiates a useralert, such as an audible chime. The user alert notifies the user 42about the state of the door sub-assembly 34. The user 42 can thenaddress the issue by moving the door sub-assembly 34 to the door closedposition. The method 300 moves from the step 320 to the step 304.

Features of the disclosed examples can include a tailgate assemblyhaving a door that can be opening to access a cargo box whilemaintaining existing functionality of a bumper step. The door can beremoved and stored for fifth wheel hitching.

The preceding description is exemplary rather than limiting in nature.Variations and modifications to the disclosed examples may becomeapparent to those skilled in the art that do not necessarily depart fromthe essence of this disclosure. Thus, the scope of protection given tothis disclosure can only be determined by studying the following claims.

What is claimed is:
 1. A tailgate assembly for a vehicle comprising: aframe sub-assembly of a tailgate, the frame sub-assembly including adriver side section having a driver side outer panel, a passenger sidesection having a passenger side outer panel, and a connection membercoupling the driver side section to the passenger side section; and adoor sub-assembly of the tailgate, the door sub-assembly having a doorouter panel, the door sub-assembly and the frame sub-assembly pivotabletogether about a first axis between a tailgate closed position and atailgate open position; the door sub-assembly pivotable relative to theframe sub-assembly about a second axis between a door closed positionand a door open position, the door sub-assembly disposed between thedriver side section and the passenger side section when in the doorclosed position such that the door sub-assembly separates the driverside outer panel from all portions of the passenger side outer panel. 2.The tailgate assembly of claim 1, wherein, when the door sub-assembly isin the closed position, a first split line separates the driver sideouter panel from the door outer panel, wherein, when the doorsub-assembly is in the closed position, a second split line separatesthe passenger side outer panel from the door outer panel, the firstsplit line separate and distinct from the second split line.
 3. Thetailgate assembly of claim 2, wherein the first and second split lineseach extending vertically across the tailgate assembly when the doorsub-assembly and the frame sub-assembly are in the tailgate closedposition.
 4. The tailgate assembly of claim 1, wherein no portion of thedoor outer panel horizontally overlaps with any portion of the driverside outer panel or the passenger side outer panel.
 5. The tailgateassembly of claim 1, wherein the door sub-assembly in the door openposition provides a cargo bed access opening, when the door sub-assemblyand the frame sub-assembly are in the tailgate closed position, thecargo bed access opening extends vertically at least as far as avertically bottommost side of the driver side outer panel and thepassenger side outer panel.
 6. The tailgate assembly of claim 1, whereinthe first axis is transverse to the second axis.
 7. The tailgateassembly of claim 6, wherein the first axis is a horizontally extendingaxis and wherein the second axis is a vertically extending axis.
 8. Thetailgate assembly of claim 1, wherein the tailgate is vertically alignedwhen in the tailgate closed position, wherein the tailgate ishorizontally aligned when in the tailgate open position.
 9. The tailgateassembly of claim 1, wherein the driver side section includes a driverside outer panel, the passenger side section includes a passenger sideouter panel, and the door sub-assembly includes a door outer panel,wherein no portion of the door outer panel horizontally overlaps withany portion of the driver side outer panel or the passenger side outerpanel.
 10. The tailgate assembly of claim 1, further comprising a stepassembly having a flip step moveable between a stowed position and aflipped position, the flip step in the flipped position providing a stepsurface for a user.
 11. The tailgate assembly of claim 10, wherein theflip step includes ribbed support structure on the step surface.
 12. Thetailgate assembly of claim 10, wherein the flip step includes a channelconfigured to receive at least a portion of a trailer hitch when theflip step is in the flipped position.
 13. The tailgate assembly of claim10, wherein the step assembly having the flip step is adjacent a bumperstep.
 14. A tailgate assembly for a vehicle comprising: a framesub-assembly that includes a driver side section having a driver sideouter panel, a passenger side section having a passenger side outerpanel, and a connection member coupling the driver side section to thepassenger side section; a door sub-assembly disposed between the driverside section and the passenger side section, the door sub-assembly andthe frame sub-assembly pivotable together about a first axis between atailgate closed position and a tailgate open position; the doorsub-assembly pivotable relative to the frame sub-assembly about a secondaxis between a door closed position and a door open position; and atleast one gooseneck hinge pivotably connecting the door sub-assembly tothe frame sub-assembly.
 15. The tailgate assembly of claim 14, whereinthe driver side outer panel and the passenger side outer panel areseparate and distinct from each other, wherein the driver side outerpanel and the passenger side panel are spaced a distance from eachother.
 16. The tailgate assembly of claim 14, wherein the first axis isa horizontally extending axis and wherein the second axis is avertically extending axis.
 17. A method of providing access to a cargobed of a vehicle, the method comprising: providing a tailgate assemblythat includes a door sub-assembly and a frame sub-assembly, the doorsub-assembly and the frame sub-assembly pivotable together between atailgate closed position and a tailgate open position; and pivoting thedoor sub-assembly relative to the frame sub-assembly to provide a cargobed access opening that spans vertically across the tailgate assembly .18. The method of claim 17, further comprising unlatching the doorsub-assembly from the frame sub-assembly to permit the pivoting, andpermitting the unlatching when the tailgate assembly is in a tailgateclosed position and preventing the unlatching when the tailgate is in atailgate open position.
 19. The method of claim 17, further comprisingpermitting the tailgate assembly to pivot from a tailgate closedposition to a tailgate open position when the door sub-assembly is inthe door closed position, and preventing the tailgate assembly frompivoting from the tailgate closed position to the tailgate open positionwhen the door sub-assembly is in the door open position.
 20. The methodof claim 17, further comprising, when the door-subassembly is in a doorclosed position, pivoting the tailgate assembly to a tailgate openposition, and extending a tailgate step from a stowed position into astepping position, the tailgate step in the stowed position at leastpartially retracted within the door-subassembly.